Leviticus 24:1-4

And Jehovah spake unto Moses, saying, Command the children of Israel, that they bring unto thee pure olive oil beaten for the light, to cause a lamp to burn continually. Without the veil of the testimony, in the tent of meeting, shall Aaron keep it in order from evening to morning before Jehovah continually: it shall be a statute for ever throughout your generations. He shall keep in order the lamps upon the pure candlestick before Jehovah continually.